[color=#000000]Any [/color][color=#980000][b]quadrilateral that is inscribed inside a circle[/b][/color][color=#000000] is said to be a [/color][i][color=#980000][b]cyclic quadrilateral[/b][/color][color=#000000].[/color][/i][color=#000000] [br][br]In the applet below, a cyclic quadrilateral (with movable vertices) is shown. [br][br]Slide the slider slowly and carefully observe what happens. Then, reset the applet. [br]Change the locations of the BIG POINTS and repeat this process. [/color]